Complex Three-dimensional Numerical Model Of Geological Generation Technology And Its Application

This paper adopted the three-dimensional modeling software of GOCAD and finite element software of ABAQUS to analyse the landslip of pingzhai from Guizhou to Guangdong,and some useful conclusions are obtained as follows:1.The structure of GOCADSGRID unit issimilar to the reduced integral unit of ABAQUS hexahedron's,the only different is unit node arrangement.Therefore,we can reorder nodesthrough the programming languages,and complete the transformation from GOCAD model to ABAQUS model.2.Using the structural unit(beam element)to reinforce subgrade cross-section two-dimensional model between DK51+980.04?DK52+094.26 of guiguanghigh-speed rail,the calculation results show thatthe slope safety factor is 1.35 when the anti-slide pile is used in frontal slope,while the slope safety factor is 1.2 when the anti-slide pile is used in trailing edge of slope.This shows the effectiveness of the anti-slide pile to reinforce the slope,and the slope safety factor is obviously improved.At the same time,the anti-slide pileused in frontal slope has a greater influence on the safety factor of landslide than the anti-slide pile used intrailing edge of slope.This is because when the anti-slide pile is used in trailing edge of slope,it only resists the thrust of a small percentage of soil behind,and has no influence on the front Soil landslide.3.Using 2D modeling and 3D modeling to the same slope,the results obtained through strength subtraction calculation shows that Two-dimensional slope safety factor is 1.01 in the natural state,but the safety factor is 1.03 in the three dimensional state.It is obviousthat the safety factor is larger in three-dimensional condition.This is because calculation is a planein the condition of two-dimensional,regardless the surrounding soil cohesive force and friction factors on the slope.4.If anti-slide pile spacing is different,it will have different influence on slope stability.With the increase of pile spacing,pile shear has gradually increased.The maximum of shear valueis 5500kN when pile spacing is 12m,and when the pile spacing is 3m,the minimum of shear value is 1400kN.With the increase of pile spacing,pile bending also increases gradually.When pile spacing is 12m,the maximum of pile bendingis 14000kN.m,and when the pile spacing is 3m,the minimum of bending is 6000kN.m.With the increase of pile spacing,pile displacement increases gradually.When the pile spacing is 2m,the maximum of displacement is 22.6mm,and when the pile spacing is 3m,the minimum of displacement is 8mm.5.Different pile location affects the stability of the landslide safety coefficient.When anti-slide pile is located in the middle of the landslide,the landslide safety coefficient is the largest.But the length of pile body is the longest,and the shear force and bending of pile is also the biggest.Although this kind of pile position is effective,engineering cost is larger,and not economic,so it is not the ideal pile position;When anti-slide pile is located in the leading edge and trailing edge,safety coefficient is small,and pile shear force and bending is relatively small.But through the deformation of the plastic zone,it is found that therear soil of pile has a tendency to slide around the pile.This situation might lead to pile rear soil slide slipps outaround the pile top,andthe pile front soilslipps off.